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A 15 gallon tank will limit what fish/corals you can successfully raise. The blue "Dory" fish is a Blue Tang which requires at least 180 gallon tank. Even if it starts out small, they get quite big and need room to move.http://www.liveaquaria.com/product/p...330&pcatid=330
But you could successfully have a couple Ocellaris Clowns and some basic corals.

I started out with a 14 gallon tank that was already set up but very neglected and needed a lot of TLC. I've now moved up to a 37 gallon. Honestly you should start with the largest tank you have room for and can afford. The larger the tank the easier it is to tend to. I didn't know how much easier it would be till I made the move up myself.
You can search online for a local fish store and if all else fails you may have a Petco nearby that has saltwater fish and supplies but I recommend an independent store over that.
A LFS (local fish store) can sell you salt water or reef water (saltwater with more minerals necessary for reef corals if you want to do corals too.)
You will need about 12-15 lbs of 'live rock' which you can get at a LFS, or you can buy dry rock and cure it yourself but it will take longer for your tank to cycle and set up. You also can by RO/DI water from the LFS and buy salt to add to it. You will need something like a refractometer to measure salinity (1.024-1.026).

Before you jump into it, read all you can on here about setting up a tank and decide what you want to do with it. Thats a lot cheaper than starting a tank and killing fish that cost you $30-$40 each because you didn't know to measure Nitrates and do water changes. It can be difficult to start a tank but once its going its almost on autopilot
Good Luck

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

A true aquarist knows what it feels like to step on a sharp piece of graveldo as I say, not as I do- WilliamI think if someone thinks clownfish are called nemos they should banned from keeping sw tank.

You could also save a lot of money and buy some live rock from a fellow hobbyist. I can always find live rock for sale by fellow hobbyist in the small city that I live. You will save a a lot of money do it this way. I like this approach best as you can inspect the rock before buying it to make sure you are getting good quality rock.

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

Yeah but this stuff is shipped in water and basicaly is worth twice as much as it is sold for and it sometimes well most of the time comes with coral and u can get fish and stuff when u order so its a good way to get your feet wet

A true aquarist knows what it feels like to step on a sharp piece of graveldo as I say, not as I do- WilliamI think if someone thinks clownfish are called nemos they should banned from keeping sw tank.